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19 April 2011Detection of active corrosion in reinforced and prestressed concrete: overview of NIST TIP project
The US transportation infrastructure has been receiving intensive public and private attention in recent years. The
Federal Highway Administration estimates that 42 percent of the nearly 600,000 bridges in the Unites States are in need
of structural or functional rehabilitation1. Corrosion of reinforcement steel is the main durability issue for reinforced and
prestressed concrete structures, especially in coastal areas and in regions where de-icing salts are regularly used.
Acoustic Emission (AE) has proved to be a promising method for detecting corrosion in steel reinforced and prestressed
concrete members. This type of non-destructive test method primarily measures the magnitude of energy released within
a material when physically strained. The expansive ferrous byproducts resulting from corrosion induce pressure at the
steel-concrete interface, producing longitudinal and radial microcracks that can be detected by AE sensors. In the
experimental study presented herein, concrete block specimens with embedded steel reinforcing bars and strands were
tested under accelerated corrosion to relate the AE activity with the onset and propagation stages of corrosion. AE data
along with half cell potential measurements and galvanic current were recorded to examine the deterioration process.
Finally, the steel strands and bars were removed from the specimens, cleaned and weighed. The results were compared
vis-à-vis Faraday's law to correlate AE measurements with degree of corrosion in each block.
M. A Gonzalez-Nunez,A. Nanni,F. Matta, andP. Ziehl
"Detection of active corrosion in reinforced and prestressed concrete: overview of NIST TIP project", Proc. SPIE 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, 79832I (19 April 2011); https://doi.org/10.1117/12.880416
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M. A Gonzalez-Nunez, A. Nanni, F. Matta, P. Ziehl, "Detection of active corrosion in reinforced and prestressed concrete: overview of NIST TIP project," Proc. SPIE 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, 79832I (19 April 2011); https://doi.org/10.1117/12.880416